Getting back to the original question, DPL II and DPL IIx is what Mark said, a mode that takes 2 channel sound and artifically create a 5.1/7.1 sound field. Which could yeild some nice results or odd ones, depending on the source of the 2 channel....T.V. VHS tape, CD music, Radio and others. I would not recommed using with descrete sources 4.1/5.1 and 6.1. You would be altering the intendend mix by the engineer. but that just me IMHO.